I.L. 40-386.3
(10/94) 2-11
The program is further controlled by the RI Type setting:
RI Type setting
NO RI: 3PRN provides no output,
therefore, will not operate RI2.
RI Type setting
ØG RI: 3PRN will provide output “1”
on single-phase-to-ground
fault only and will operate
RI2.
RI Type setting
ØØ, ØG, RI: 3PRN will provide output “1”
on single- phase- to- ground
fault or 2-phase faults, and
will operate RI2.
RI Type setting
3Ø, ØØ, ØØG, ØØ RI:
3PRN will provide output “1” on any
type of fault, and will operate RI2.
The Zone1 RI (Z1RI), Zone2 RI (Z2RI) and Zone3 RI (Z3RI) settings are provided for pro-
gramming on applications where the Reclosing Initiation on Zone1, Zone2 or Zone3
trip is desired. Logic AND-62A is controlled by the signal of 3PRN, therefore, the setting
of ØG RI (1PR), ØØ, ØG, RI (2PR) and 3Ø, ØØ, ØØG, ØØ RI (3PR) also affect the Zone1RI,
Zone2RI and Zone3RI.
In general, the Reclosing Block (RB) relay will operate on TDT (Time Delay Trip) or OSB
(Out-of-Step Block condition). However, it will be disabled by the setting of Zone1RI,
Zone2RI, and Zone3RI signal.
2.4.15 Output Contact Test
A “Push-to-Close” feature is included in order to check all output relay contacts, which
include TRIP, BFI, RI2, RB, AL1, AL2, GS, Carrier Send (Pilot), Carrier Stop (Pilot) and
each separate programmable contact output when purchased. The relay contact check
is supplementary to the self-check because the Microprocessor self-check routine can-
not detect the output hardware. In order to enable the contact test, jumper (JMP5) on
the Microprocessor module must be connected. (See Table 5-3 for detailed procedures.)
2.4.16 Out-of-Step Block Logic
The Out-of-Step Blocking (OSB) logic (power swing block supervision) in REL 301/302
is a double blinder scheme. It contains two blinder units, providing 4 blinder lines. The
nature of the logic (shown in Figure 2-18a) is that the outer blinder 21BO must operate
50ms or more ahead of the inner blinder 21BI, in order for an OSB condition to be
identified. The OSB signal is a negated input to the AND-131 (Z1Ø), AND-147 (Z2P),
AND-160 Zone3Ø (Z3P), and AND-176 Pilot Ø (PLTP) for supervising the 3-phase dis-
tance trip. In addition to controlling the OSB logic, the blinder units also may be used
to supervise distance relay tripping. Phase distance unit tripping cannot take place
To Next Page
Loading...
